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Histological Classification of Mammary Tumors of the Dog and Cat

CANINE

1 Malignant Tumors
1.1 Noninfiltrating (in situ) carcinoma
1.2 Complex carcinoma
1.3 Simple carcinoma
1.3.1 Tubulopapillary carcinoma
1.3.2 Solid carcinoma
1.3.3 Anaplastic carcinoma
1.4 Special types of carcinomas
1.4.1 Spindle cell carcinoma
1.4.2 Squamous cell carcinoma
1.4.3 Mucinous carcinoma
1.4.4 Lipid-rich carcinoma
1.5 Sarcoma
1.5.1 Fibrosarcoma
1.5.2 Osteosarcoma
1.5.3 Other sarcomas
1.6 Carcinosarcoma
1.7 Carcinoma or sarcoma in benign tumor
2 Benign Tumors
2.1 Adenoma
2.1.1 Simple adenoma
2.1.2 Complex adenoma
2.1.3 Basaloid adenoma
2.2 Fibroadenoma
2.2.1 Low-cellularity fibroadenoma
2.2.2 High-cellularity fibroadenoma
2.3 Benign mixed tumor
2.4 Duct papilloma
3 Unclassified Tumors
4 Mammary Hyperplasias/Dysplasias
4.1 Ductal hyperplasia
4.2 Lobular hyperplasia
4.2.1 Epithelial hyperplasia
4.2.2 Adenosis
4.3 Cysts
4.4 Duct ectasia
4.5 Focal fibrosis (fibrosclerosis)
4.6 Gynecomastia

FELINE

1 Malignant Tumors
1.1 Noninfiltrating (in situ) carcinoma
1.2 Tubulopapillary carcinoma
1.3 Solid carcinoma
1.4 Cribriform carcinoma
1.5 Squamous cell carcinoma
1.6 Mucinous carcinoma
1.7 Carcinosarcoma
1.8 Carcinoma or sarcoma in benign tumor
2 Benign Tumors
2.1 Adenoma
2.1.1 Simple adenoma
2.1.2 Complex adenoma
2.2 Fibroadenoma
2.2.1 Low-cellularity fibroadenoma
2.2.2 High-cellularity fibroadenoma
2.3 Benign mixed tumor
2.4 Duct papilloma
3 Unclassified Tumors
4 Mammary Hyperplasias/Dysplasias
4.1 Ductal hyperplasia
4.2 Lobular hyperplasia
4.2.1 Epithelial hyperplasia
4.2.2 Adenosis
4.2.3 Fibroadenomatous change (feline mammary hypertrophy, fibroepithelial hypertrophy)
4.3 Cysts
4.4 Duct ectasia
4.5 Focal fibrosis (fibrosclerosis)
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